A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of the text, which is the ban on alcohol. It gives a clear overview of the situation and does not need any other sentence for context. It sets the stage for the discussion about Prohibition. Why other lines are not chosen? The other paragraphs are not chosen because they do not meet the criteria for being independent. For example, Paragraph 2 starts with "The ban was known as Prohibition," which refers back to the ban mentioned in Paragraph 1. Paragraph 3 starts with "Millions of litres of wine and spirits were thrown away," which assumes knowledge of the ban. Paragraph 4 uses "the law" which refers to the ban, and Paragraph 5 starts with "After America had been hit by the Depression," which is a specific context that does not stand alone.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion. It shows the result of the earlier ban and explains why alcohol was allowed again. It brings together the main ideas of the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it uses the word "the ban" to refer back to the ban mentioned in Paragraph 1. This shows a clear link between the two sentences.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it continues the discussion about the ban. It explains what happened as a result of the ban, showing a logical order of ideas.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains the consequences of the ban not working well. It shows how the law was broken, which is a direct result of the failure of the ban.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it shows a change in the situation after the ban. It explains why alcohol was allowed again, linking the previous discussion about the law being broken to the new context of the Depression.